Spirally-bound sheaf



Jan. 2, 1934. s. GROENER SPIRlfxLLY BOUND SHEAF Filed June 6, 1955 /NVEA/TOR Jaamwl ramm',

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UNITED STATES PATENT OFFICE SPlBALLY-BOUND SEEAF Samuel Groenen', Paris,France, assigner to- Frank Amato, New York, N. Y.

Application June s, 193s. sensi No. masa s chum. (ci. :s1-z5) My presentinvention relates generally to the is not exactly in proportion to thespacing of the employment of a helical binding element for holes in thesheets and a further cause is the maintaining sheaves or stacks of paperor the 'like catching of the terminal portions of the binding inassociated relation and against accidental sepelement, either on thesurface of the paper or 5 aration. within the holes thereof. All ofthese causes, as 60 My invention in one of its aspects is an imhas4 beenmentioned, tend to work loose the bindprovement on the arrangement shownin United ing element, necessitating constant adjustment of StatesLetters Patent 1,516,932 issued on Novemthe spring to bring it back intoits normal posiber 12, 1924. This patent shows a helical bindtion, andalso result in injury to the leaves of the ing element threaded througha group of equibook .because of the tearing eiect on the paper 65distantly spaced openings in a stack of sheets for of the ends of thebinding element. maintaining said sheets in associated relation. Myinvention, therefore, contemplates the pro- It, however, has noprovision for limiting the relavision of means for avoiding undesirabledisplacetive movement between the stack and the spiral ment of thebinding element thereby avoiding iny binding element and therefore forpreventing acconvenience and damage, without, in any way, in- 70cidental disassociation of the two. terfering with the use of the book.

The general object of my invention is the pro- Referring t0 the drawingin detail, I Show at 11 vision of means for preventing the accidental astack of paper sheets, which are, by way of exdisassociation of anelement of a stack from its ample. Shown as all of the same size and ofrecposition therein or of the stack as an entirety tangular form,although they need not necessarily 75 from its relation to the helicalbinding element. be so. The stack of sheets has a row of holes 13 It isa further object of the invention that the which are ShOWn aSequidistantly spaced and means as hereinabove referred to for preventingwhich are intended to accommodate the coils of disassociation shall beso devised and related as a helical element 15 by a threading Operation.

to interfere to the minimum degree with the free I have found itconvenient t0 use a Spiral Spring 80 manipulation of the sheets withreference to each fOr this pllrpOSe, although other materials not otherand with reference to the spiral binding necessarily elastic or exiblewill answer my Durmember` pose, provided they offer the proper rigidity.At

For the attainment ef these objects and such 17, I show the terminals ofthe element 15 bent other ebjeets es w11] hereinafter appear er be at anangle to the direction of the coils, and as 85 pointed out, I haveillustrated several forms of Clearly ShOWn in Figure 2. these terminalp01'- my invention in the drawing, wherein: tions are bent underneaththe adjacent coil which Figure 1 discloses one embodiment 0f my in-Serves t0 Support them in position against certain vention in itsrelation to a stack of sheets of displacing fOreeS S0 8S t0 positionthem substanpeper in beek ferm; tially within the surface of thecylinder contain- 90 Figure 2 is an enlarged detail view of the bindingthe 00115 0f the Spiral Spring. This abrupting element of Figure 1 withthe midd1e portionk-.interrllption in the helical Course 0f the coilswill emitted; l prevent retraction of the coils from the holes with-Figure 3 is a detail view of a portion of the bindout, however,preventing any substantial obstacle 40 ing element, similar to Figure 2,except that it is t0 the freeangulardisplacement of sheets for 95 takenat right angles thereto as indicated by the substantially 360. In thismanner also the terline 3-3 and the arrows; minals 17 are protected bytheir contact with the Figure 4 is an end view of the binding elementadjacent coils of the spring 15 against displaceof Figure 1; and ment,and they are also located so that the backs Figure 5 and 6 showrespectively a side view and of the individual leaves cannot come incontact 100 an end view of a portion of a modified form of therewith andbe torn, as might be the case if the the binding element. terminalsprojected into the interior of the spring. Asdisclosedintheaforementioned U. S. Letters I have found the construction justdescribed Patent, it is found that the spiral binding elevery convenientin the relation described. Other i0 mentwlll tend to work loose from thestack, parforms may be found convenient for other pur- 105 ticularlywhere there is substantial friction be-. poses. For instance, in Figures5. and 6, I show tween the stack and the binding element as where a coilspring 15 with its endsdeformed from the coils of the binding elementare of small diamtheir helical course and located in a plane indieter inrelation to the height of the stack of sheets cated at P, whereas thenormal helical formation they unite, or where the pitch of the helicalcoils is indicated at S. In other words, the terminal 110 must bedeformed back into the helical contour,

and this is resisted by the element in proportion to the rigidity of thematerial of which it is conlstituted.

Having thus described my invention and illustrated its use, what I claimas new and desire to secure by Letters Patent is:

1. In combination with a stack of superimposed paper sheets or the like,having adjacent one edge thereof a series of substantially evenly spacedperfforations. a helical element engaging said perforations so as toflexibly unite the sheets, the terminal portions of said element beingbent from their helical conformation through substantially a rightangle, and being of a length so that they extend beneath the nextadjacent coil, whereby said terminal portions are disposed substantiallylongitudinally of said helical element and within an imaginarycylindrical surface containing said helix, and whereby'saidterminalportions are. adapted to prevent disassociation of said helical.

element from the perforations, without destroying the ilexibility of theconnection.

2. A binding element for associating sheets of paper or the like in bookform comprising a series of spaced coils in end to end relation and aterminal portion of an end coil bent at substantially a right angle tothe course of the coil and into adjacency with the inside portion of thenext adjacent coil. p

3. A binding element for associating sheets of paper'or the like in bookform comprising a series of spaced coils in end to end relation and eachof the terminal .portions of the end coils being bent into the generaldirection of the axis of the coil and into adiacency with the insideportion of the next adjacent coil.

' SAMUEL GROENER.

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